Thermal Dynamics PakMaster 75XL Plus, Operating Manual

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OPERATION 4-4 Manual 0-2746
4.03 Sequence of Operation
The following is a typical sequence of operation for this
cutting system. Refer to Appendix 2 for a block diagram.
1. Close main power source disconnect.
a. AC power is available at the Power Supply.
2. Place RUN / SET / LATCH switch to RUN mode.
3. Place the ON / OFF power switch on the front
panel of the Power Supply to ON.
a. AC Power indicator blinks ON and OFF for
eight seconds then stays ON.
b. Fans turn on.
4. Place RUN / SET / LATCH switch to SET mode.
a. Gas solenoid opens and gas flows to set pres-
sure.
b. GAS indicator turns ON.
NOTE
GAS indicator will not come ON if the gas pres-
sure is set below 35 psi / 2.4 bar at the Regulator
/ Filter Assembly.
NOTE
Minimum pressure for power supply operation is
lower than minimum pressure for torch operation.
5. Place RUN / SET / LATCH switch to RUN mode.
a. Gas flow stops.
b. GAS indicator turns OFF.
6. Protect eyes and press or activate torch switch
a. Gas pre - flows starts.
b. GAS indicator turns ON.
7. After gas pre - flow (approximately 2 seconds)
a. Power supply enabled.
b. DC indicator turns ON.
c. Pilot relay closes.
8. Pilot arc is established
9. Move Torch within transfer distance of workpiece.
a. Main arc transfer.
b. Pilot arc OFF.
10. Optional - Place RUN / SET / LATCH to LATCH
mode.
NOTE
For general cutting, use the RUN position which
provides normal touch operation where the torch
switch must be held throughout the main arc trans-
fer.
For specific applications, use the LATCH position
where the torch switch can be released after the main
arc transfer. The torch remains activated until the
main arc breaks from the workpiece.
11. Complete cutting operation.
NOTE
If the torch is lifted from the workpiece, with torch
switch activated, the main arc will stop and the
pilot arc will automatically restart.
12. Release or deactivate the torch switch.
a. Main arc stops.
b. Pilot arc stops (power supply enable signal re-
moved).
NOTE
If torch is activated during post - flow, pilot arc
will immediately restart.
If torch is within 3/8 in / 9.5mm transfer distance
of workpiece, main arc will transfer.
13. Gas will flow for 15 seconds (post - flow).
a. Gas solenoid closes
b. Gas flow stops.
c. GAS indicator turns OFF.
14. Place the ON / OFF power switch on the front
panel of the unit to OFF
a. AC Power indicator turns OFF.
b. Fans turn OFF.
15. Place the main power disconnect to open.
a. Main AC power is removed from the system.